HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 531
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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Retransmission: Retransmission is described below for the separate cases of transmit mode and
receive mode.
Retransmission when SCI is in Receive Mode (See Figure 14-11):
(1) The SCI checks the received parity bit. If it detects an error, it automatically sets the PER flag
(2) The RDRF bit in SSR is not set to 1 for the error frame.
(3) If an error is not detected when the parity bit is checked, the PER flag is not set in SSR.
(4) If an error is not detected when the parity bit is checked, receiving operations are assumed to
(5) When a normal frame is received, at the error signal transmit timing, the data pin is held in
to 1. If the RIE bit in SCR is set to the enable state, an ERI interrupt is requested. The PER
flag should be cleared to 0 in SSR before the next parity bit sampling timing.
have ended normally, and the RDRF bit is automatically set to 1 in SSR. If the RIE bit in SCR
is set to the enable state, an RXI interrupt is requested. If RXI is enabled as a DMA transfer
activation source, the RDR contents can be read automatically. When the DMAC reads the
RDR data, it automatically clears RDRF to 0.
the high-impedance state.
RDRF
PER
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
Figure 14-11 Retransmission in SCI Receive Mode
Frame n
DE
(2)
(1)
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
521
Retransmitted frame
(DE)
(4)
(3)
Ds
D0 D1 D2 D3 D4
Frame n + 1
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